Rotatable electric plug

Abstract

A rotatable electric plug includes a plug housing including a sleeve body, a plug module including a mounting body and at least a protruding pin, and a limiting assembly coupled to the sleeve body and the mounting body. The mounting body is rotatably coupled in the sleeve body that a rotational movement of the mounting body is reversible. The mounting body has a first side and an opposed second side that a portion of the protruding pin is extended from the first side of the mounting body. The limiting assembly is arranged to block the plug module from rotating infinitely at the plug housing in one direction. The rotatable electric plug has the advantages of enabling the reversibly rotational movement of the plug module, enhancing the rotational movement of the plug module, retaining the plug module at an angular angle, and preventing the plug module from being infinitely rotated.

What is claimed is: 
     
       1. A rotatable electric plug, comprising:
 a plug housing, which comprises: 
 a sleeve body having a hollow structure; 
 a blocking rim inwardly extended from an inner wall of said sleeve body; 
 a receiving groove formed at said blocking rim; 
 a plurality of guiding protrusions; and 
 a ball bearing element rotatably received at said receiving groove; 
 a plug module which comprises a mounting body rotatably coupled in said sleeve body that a rotational movement of said mounting body is reversible, and at least a protruding pin extended from said mounting body, wherein said mounting body has a first side and an opposed second side that a portion of said protruding pin is extended from said first side of said mounting body, said guiding protrusion spacedly extending from said blocking rim to contact with said first side of said mounting body for ensuring the rotational movement of said mounting body in a stable and balancing manner, said ball bearing element being arranged to bias against said first side of said mounting body so as to enhance said rotational movement of said mounting body, said mounting body engaging with said blocking rim to prevent said mounting body detaching from said sleeve body while said mounting body is rotatably coupled at said sleeve body; and 
 a limiting assembly coupled to said sleeve body and said mounting body to block said plug module from rotating infinitely at said plug housing in one direction. 
 
     
     
       2. The rotatable electric plug, as recited in  claim 1 , wherein said mounting body further comprises at least a coupling member extended from said first side of said mounting body, wherein said coupling member has a latch free end extended to engage with a back side of said blocking rim to rotatably couple said mounting body at said sleeve body. 
     
     
       3. The rotatable electric plug, as recited in  claim 2 , wherein said mounting body further has a plurality of first sliding grooves spacedly formed at said first side of said mounting body, wherein said ball bearing element is rotatably slid at said first side of said mounting body from one of said first sliding grooves to another said sliding groove to rotate said mounting body at said sleeve body, wherein said ball bearing element is slid to engage with one of said first sliding grooves to retain an angular angle of said mounting body. 
     
     
       4. The rotatable electric plug, as recited in  claim 1 , wherein said mounting body further has a plurality of first sliding grooves spacedly formed at said first side of said mounting body, wherein said ball bearing element is rotatably slid at said first side of said mounting body from one of said first sliding grooves to another said sliding groove to rotate said mounting body at said sleeve body, wherein said ball bearing element is slid to engage with one of said first sliding grooves to retain an angular angle of said mounting body. 
     
     
       5. The rotatable electric plug, as recited in  claim 4 , wherein said plug housing further comprises at least a sliding blocker provided at said blocking rim and extended to slidably contact with said first side of said mounting body, such that when said ball bearing element is slid at said first side of said mounting body, said sliding blocker is correspondingly slid at said first side of said mounting body, and when said ball bearing element is engaged with one of said first sliding grooves, said sliding blocker is engaged with another said sliding groove to stop said rotational movement of said mounting body. 
     
     
       6. The rotatable electric plug, as recited in  claim 3 , wherein said first sliding grooves are radially indented on said first side of said mounting body and extended to a peripheral edge of said mounting body. 
     
     
       7. The rotatable electric plug, as recited in  claim 6 , wherein said plug housing further comprises at least a sliding blocker provided at said blocking rim and extended to slidably contact with said first side of said mounting body, such that when said ball bearing element is slid at said first side of said mounting body, said sliding blocker is correspondingly slid at said first side of said mounting body, and when said ball bearing element is engaged with one of said first sliding grooves, said sliding blocker is engaged with another said sliding groove to stop said rotational movement of said mounting body. 
     
     
       8. The rotatable electric plug, as recited in  claim 2 , wherein said plug housing further has a second sliding groove having a circular configuration coaxially formed at said blocking rim, wherein said mounting body further has a protrusion member protruded from said first side of said mounting body to slidably engage with said second sliding groove to guide said rotational movement of said plug module. 
     
     
       9. The rotatable electric plug, as recited in  claim 1 , wherein said limiting assembly comprises a first limiting member radially extended from said blocking rim and a second limiting member protruded from said first side of said mounting body, wherein said mounting body is rotated until said second limiting member is contacted with said first limiting member to block a further rotational movement of said plug module so as to prevent said plug module from being infinitely rotated at said plug housing. 
     
     
       10. The rotatable electric plug, as recited in  claim 9 , wherein said first limiting member has a first limiting surface and an opposed second limiting surface, wherein said second limiting member has a third limiting surface and an opposed fourth limiting surface, wherein when said mounting body is rotated in one direction until said third limiting surface is contacted with said first limiting surface, said plug module is blocked to further rotate in said direction, wherein when said mounting body is reversibly rotated in an opposite direction until said fourth limiting surface is contacted with said second limiting surface, said plug module is blocked to further rotate in said opposite direction. 
     
     
       11. The rotatable electric plug, as recited in  claim 6 , wherein said limiting assembly comprises a first limiting member radially extended from said blocking rim and a second limiting member protruded from said first side of said mounting body, wherein said mounting body is rotated until said second limiting member is contacted with said first limiting member to block a further rotational movement of said plug module so as to prevent said plug module from being infinitely rotated at said plug housing. 
     
     
       12. The rotatable electric plug, as recited in  claim 11 , wherein said first limiting member has a first limiting surface and an opposed second limiting surface, wherein said second limiting member has a third limiting surface and an opposed fourth limiting surface, wherein when said mounting body is rotated in one direction until said third limiting surface is contacted with said first limiting surface, said plug module is blocked to further rotate in said direction, wherein when said mounting body is reversibly rotated in an opposite direction until said fourth limiting surface is contacted with said second limiting surface, said plug module is blocked to further rotate in said opposite direction. 
     
     
       13. The rotatable electric plug, as recited in  claim 8 , wherein said limiting assembly comprises a first limiting member radially extended from said blocking rim and a second limiting member protruded from said first side of said mounting body, wherein said mounting body is rotated until said second limiting member is contacted with said first limiting member to block a further rotational movement of said plug module so as to prevent said plug module from being infinitely rotated at said plug housing. 
     
     
       14. The rotatable electric plug, as recited in  claim 13 , wherein said first limiting member has a first limiting surface and an opposed second limiting surface, wherein said second limiting member has a third limiting surface and an opposed fourth limiting surface, wherein when said mounting body is rotated in one direction until said third limiting surface is contacted with said first limiting surface, said plug module is blocked to further rotate in said direction, wherein when said mounting body is reversibly rotated in an opposite direction until said fourth limiting surface is contacted with said second limiting surface, said plug module is blocked to further rotate in said opposite direction.